Picture of virus under microscope

Research under the microscope...

The Strathprints institutional repository is a digital archive of University of Strathclyde research outputs.

Strathprints serves world leading Open Access research by the University of Strathclyde, including research by the Strathclyde Institute of Pharmacy and Biomedical Sciences (SIPBS), where research centres such as the Industrial Biotechnology Innovation Centre (IBioIC), the Cancer Research UK Formulation Unit, SeaBioTech and the Centre for Biophotonics are based.

Explore SIPBS research

Geometric phases for mixed states in interferometry

Sjoqvist, E and Pati, A K and Ekert, A and Anandan, J S and Ericsson, M and Oi, D K L and Vedral, V (2000) Geometric phases for mixed states in interferometry. Physical Review Letters, 85 (14). pp. 2845-2849. ISSN 0031-9007

[img]
Preview
PDF
0005072v2.pdf - Preprint

Download (127kB) | Preview

Abstract

We provide a physical prescription based on interferometry for introducing the total phase of a mixed state undergoing unitary evolution, which has been an elusive concept in the past. We define the parallel transport condition that provides a connection form for obtaining the geometric phase for mixed states. The expression for the geometric phase for mixed state reduces to well known formulas in the pure state case when a system undergoes noncyclic and unitary quantum evolution.